Under which market structure does the action of one firm have a spillover effect on the decision of another firm

Who is not spending wisely? erika goes shopping and saves her receipts. she totals how much she spent and writes it down. mia needs to buy a new pair of shoes because she joined the soccer team. she looks at newspaper ads to find the best price. lauren has been thinking about getting a puppy for a long time. she walks by the pet store at the mall and decides to get a puppy. erin makes a purchase online using a credit card. she knows that she can pay the entire bill when it arrives.

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True or false: a fitted model with more predictors will necessarily have a lower training set error than a model with fewer predictors.